Yeah no Breast Expansion is off the table.
To be specific about whats acceptable, the line is drawn at cute, flirty interactions; something generally acceptable to everyone, like a kiss or a teasing remark. But you should be more focused on gameplay systems :L
I’ve been thinking about including some examples in the description beyond some name drops, but I might also include a surprise limitation that’s revealed when the Jam starts. I think that would reinforce the correct mindset for this Jam.